Sheriffs search, but don't find, Sierra LaMar in Uvas reservoir

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The San Francisco Giants tried to harness the power of its large fan base by using Facebook to post a flier about Sierra LaMar. If you have any information about LaMar, please call 408-808-4500 after hours 408-299-2311 or the anonymous tip line at 408-808-4431. Text messages can be sent to 408-421-6760. Email tips to: tips@sheriff.sccgov.org

Updated at 11:05 PM PST on Friday, Apr 13, 2012

Santa Clara County Sheriff's investigators and search crews came up empty on Friday on the one-month anniversary of the disappearance of Morgan Hill teenager Sierra Lamar.

Sgt. Jose Cardoza said the underwater search and rescue team did not find the 15-year-old Thursday while they scoured the Chesbro reservoir. And the team also didn't find her on Friday, when they dove to eight spots within the Uvas reservoir.

Sgt. Don Ray, who is in charge of the underwater search, said investigators chose the spots based on a review of sonar images showing objects that seemed out of place.

One of the divers, Peter Robinson, told NBC Bay Area that searching in the reservoir is like diving in darkness, it's almost impossible to see anything. All searches, he said, are based on touch.

Sierra has been missing since March 16, when she was last seen at 6 a.m. when she left to catch a school bus near her house, but never showed up for school that day. Her sad tale has made headlines and hundreds of people have scoured land and water to find her. Santa Clara County sheriff's detectives have spent 8,900 hours and poured over more than 1,400 tips regarding her disappearance.

Also on Friday, sheriff's deputies took to their dirt bikes again, searching various remote parts of southern Santa Clara County for the teen. And this weekend, investigators will re-canvas areas of Morgan Hill and re-interview neighbors and local residents.

Meanwhile, the San Francisco Giants' home opener was on Friday. The team tried to harness the power of its large fan base by using Facebook to post a flier about Sierra.

As of Friday morning, the Giants FB post on the teen had 2,875 "likes."

The Giants post simply asks the team's fans to help find Sierra and to share the post with their friends. They ask anyone who knows anything about the case to call the sheriff at 408-808-4500.

The Giants Facebook page can be found at https://www.facebook.com#!/Giants.